Apollo asteroid

Apollo asteroid

One of a small group of asteroids whose orbits intersect that of Earth. They are named for the prototype, Apollo.

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Industry/Domain: Astronomy
Category: General astronomy
Company: Caltech
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apollo asteroids

Earth science; Geology

These are asteroids that cross the Earth’s orbit.

asteroid

Archaeology; Evolution

A small rocky or metallic body orbitting the Sun. About 20,000 have been observed, ranging in size from several hundred kilometers across down to dust particles.

asteroid

Science; General science

(also called planetoid) - A medium-sized rocky object that orbits the Sun. It's smaller than a planet but larger than a meteoroid. Also, any number of small bodies that revolve ...

asteroid

Astronomy; Planetary science

A small, mostly rocky body orbiting the Sun. Asteroids range in size from 1000 kilometers in diameter to tiny objects you could hold in your hand. Most asteroids orbit the Sun ...

asteroid

Astronomy; General astronomy

boulder to mountain-sized piece of rock remaining from the early solar system. The largest asteroid is only 1000 kilometers across but most are much smaller.

astronomical unit (AU)

Astronomy; General astronomy

Approximately equal to the mean earth-sun distance, which is about 150,000,000 km or 93,000,000 miles. Formally, the AU is actually slightly less than the earth's mean distance ...

celestial coordinates

Astronomy; General astronomy

Any system for locating the positions of objects on the celestial sphere. Various systems are defined, according to the chosen point of observation (the origin) and the plane of ...

distance modulus

Astronomy; General astronomy

The difference between the apparent magnitude of an object, m, corrected for *interstellar absorption, and its absolute magnitude, M. This difference is directly linked to the ...

luminosity class

Astronomy; General astronomy

A classification of stars according to their luminosity, which can vary widely for a given *spectral type. Luminosity class indicates, for example, whether a star is a supergiant, ...

asteroid

Astronomy; General astronomy

Any of the many small rocky or metallic objects in the Solar System, mostly lying in a zone (the asteroid belt) between the orbits of Mars and Jupiter; also known as a minor ...

elliptical galaxy

Astronomy; General astronomy

A type of galaxy with a smooth, featureless circular or elliptical appearance, no spiral arms, and little or no interstellar gas or dust; symbol E. Elliptical galaxies range from ...

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